Dental tool for removing crown-pins.



PATBNTED FEB. 20, 1906. G. T. CARPENTER. DENTAL TOOL FOR REMOVING GROWNPINS.

APPLIGA'ITIO N FILED JUNE 22, 1905- UNITED STATES PATENT FFIQE.

GEORGE T. CARPENTER,

OF CHICAGO, ILLINOIS.

DENTAL TOOL FOR REMOVING'CROWN-PINS'.

T0 aZZ whom it may concern;

Be it known that I, GEORGE T. CARPEN- TER, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in DentalTools for Removing Crown-Pins; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in dental tools or vises forremoving crown-pins.

The object of the invention is to provide a vise of this character bymeans of which the crown-pin may be removed from the natural root of atooth after an artificial crown has been broken off the same.

A further object is to provide a vise of this character which will besimple, strong, and durable in construction and by the use of which afirm hold may be taken upon the crown-pin, means being provided wherebythe vise may be readly operated to with draw said pin from the root ofthe tooth.

With the above and other objects in view the invention consists ofcertain novel features of construction, combination, and arrangement ofparts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a front view of the vise,showing the parts in inoperative position. Fig. 2 is a side view of thevise, showing the manner of using the same. Fig. 3 is a side view of thelever for operating the vise; and Figs. 4 and 5 are front and sideviews, respectively, of a modifled form of tool.

Referring more particularly to the drawings, 1 denotes the vise, whichconsists of a body portion 2 and spring-jaws 3, said jaws beingpreferably tapered to a point at their lower ends. Through the jaws 3 isarranged a threaded bolt or screw 4, one end of which is secured to oneof said jaws, while the opposite end extends loosely through a transversely-disposed aperture formed in the other jaw of the vise. Adaptedto be screwed upon the projecting threaded end of the screw or bolt 4 isa thumb-nut 5, which when screwed up upon said bolt will clamp the jawsof the vise together upon the object to which they may be engaged.Through thevise is formed a longitudinally-disposed passage 6, in whichis loosely arranged a rod or post 7, the outer ends of which arepreferably Specification of Letters Patent.

Application filed June 22, 1905. Serial No. 266,493.

tapered, as shown. The upper end of the vise 1 is cut away to form aright-angularlydisposed notch 8, and in the inner side of theupwardly-projecting end of the vise is formed a recess or hollow 9. Inthe post 7, substantially midway between the ends of the same, is formeda notch or recess .10, which is adapted to be engaged by the bolt orscrew 4 to limit the movement of the rod or post 7 in'the passage 6 ofthe vise.

In Figs 1 to 3 of the drawings the vise 1 1s shown as adapted to beraised and lowered upon the post 7 by means of a right-angularly-bentlever 12, the lower rightangularlybent end of which is adapted to beengaged with the recess 9, formed in the notched upper portion of thevise, the angularly-bent end of said lever being adapted to rest uponthe upper end of the rod or post 7, which forms a fulcrum-point for saidlever, upon which the same may be rocked to raise and lower the vise onsaid post, thereby bringing the lower end of the jaws of the vise intoengagement with the crown-pin or other object to be extracted, afterwhich by rocking the lever in the opposite direction upon the end of thepost 7 said vise willbe forced outwardly, thus extracting the crown-pinor other artlcle to which the vise is connected.

In Figs. 4 and 5 is shown a modified form of operating mechanism for thevise, said mechanism being here shown as consisting of a threaded rod13, which is provided with a head 14 and is adapted to be screwed into atheaded aperture in the upper end of the vise and into engagement with{the upper end of the post 7, which in this instance is not extended tothe outer end of the vise. In using the vise having applied thereto thethreaded rod 13 said vise may be raised or lowered by the turning ofsaid threaded rod in one direc tion or the other, thus engaging the jawsof the vise with the crown-pin and withdrawing or extracting the samefrom the root of the tooth. By the use of the vise herein shown anddescribed the crown-pin in the root of Patented Feb. 20, 1906.

the natural tooth may be readily withdrawn ciple or sacrificing any ofthe advantages of this invention.

Having thus described my invention, what I claim as new, and desireto.secure by Letters Patent, is

rod or post, of a vise having formed therein a vertically-disposedpassage whereby the same is engaged with said post, spring-jaws formedon the inner end of said vise, a screw to operate said jaws and a leveradapted to be fulcrumed on said rod and en aged with said vise to forcethe latter outwardly on said rod, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

GEORGE T. CARPENTER.

Witnesses:

S. E. KNEOHT, PETER J. BROOK.

